Hello, and welcome!
Xenocara is just a packaging of X.org for OpenBSD.
Being new to OpenBSD, you might not be aware of the limited support for Nvidia products. From
www.openbsd.org/amd64.html:
Quote:
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... As with other free operating systems it is highly recommended that Nvidia cards are avoided since this vendor continues to show tremendous resistance towards releasing information that would allow X.Org to support their hardware properly.
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Perhaps using the
vesa(4) driver will solve your particular issue.